From 4572372847680ee04f184df916d5cf007c94ff7e Mon Sep 17 00:00:00 2001 From: Maarten Lankhorst Date: Wed, 11 Nov 2015 11:29:08 +0100 Subject: [PATCH] drm/core: Fix old_fb handling in drm_mode_atomic_ioctl. plane_mask should be cleared inside the retry loop, because it gets reset on every retry. Without this fix the plane->fb refcounting might get out of sync on retries, resulting in either leaked memory or use-after-free. Signed-off-by: Maarten Lankhorst Cc: stable@vger.kernel.org #v4.3 Reviewed-by: Daniel Vetter Signed-off-by: Jani Nikula Link: http://patchwork.freedesktop.org/patch/msgid/1447237751-9663-3-git-send-email-maarten.lankhorst@ubuntu.com --- drivers/gpu/drm/drm_atomic.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 7bb3845d9974..0ac31b1ecb67 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1446,7 +1446,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, struct drm_plane *plane; struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; - unsigned plane_mask = 0; + unsigned plane_mask; int ret = 0; unsigned int i, j; @@ -1486,6 +1486,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET); retry: + plane_mask = 0; copied_objs = 0; copied_props = 0; -- 2.20.1